Patent US5074641A successfully refreshed from Google Patents.
US5074641A
Expired / Lapsed
US
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Optical scanning device
Assignee: Brother Industries Ltd
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Filing: 1990-10-10
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Granted: 1991-12-24
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Expires: 2010-10-10
Abstract
Abstract An optical scanning device includes an optical waveguide array through which image information light, scanned by an optical scanning means, is successively introduced and carried. A means for correcting the intensity of light is provided to correct the intensity of the image information light. This correction is performed in correspondence with variations in light transmission efficiency in the optical waveguide. The intensity of light beams on a photosensitive material is, as a result, rendered uniform, these light beams being emitted from the optical waveguide array.
Inventors
- 👤 Hitoshi Nakai
- 👤 Yasushi Okabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:16
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/04; G02B6/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
An optical scanning device comprising: a light source from which image information light is emitted; optical scanning means for scanning the image information light emitted from said light source; an optical waveguide array for successively introducing and carrying the image information light scanned by said optical scanning means, said optical waveguide having a measureable light transmission efficiency; a memory element; and means for correcting the intensity of the image information light emitted from said light source in accordance with variations in said light transmission efficiency of said optical waveguide array, the light transmission efficiency of said optical waveguide array having previously been measured, and data of the measured light transmission efficiency being stored in said memory element.
Claim 2
Dependent Claim
117 words
An optical scanning device comprising: a light source from which image information light is emitted; optical scanning means for scanning the image information light emitted from said light source; an optical waveguide array for successively introducing and carrying the image information light scanned by said optical scanning means, said optical waveguide having a measureable light transmission efficiency; a memory element; and means for correcting the intensity of the image information light emitted from said light source in accordance with variations in said light transmission efficiency of said optical waveguide array, the light transmission efficiency of said optical waveguide array having previously been measured, and data of the measured light transmission efficiency being stored in said memory element.
Claim 3
Dependent Claim
37 words
An optical scanning device according to claim 1, wherein said correction means modulates the intensity of said light source based on the measured data of the light transmission efficiency, the data being stored in said memory element.
Claim 4
Dependent Claim
158 words
An optical scanning device comprising: a light source from which image information light is emitted; optical scanning means for scanning the image information light emitted from said light source; an optical waveguide array for successively introducing and carrying the image information light scanned by said optical scanning means said optical waveguide array having a measurable light transmission efficiency; and means for correcting the intensity of the image information light emitted from said light source in correspondence with said light transmission efficiency of said optical waveguide array, said correction means including a transistor connected to the light source, a CPU, a RAM in which measured data of the light transmission efficiency is stored, and a buffer memory in which image signals are stored, the CPU referring to the measured data of the light transmission efficiency stored in the RAM, and converting the base currrent of the transistor so as to control the quantity of light of the light source.
Claim 5
Dependent Claim
158 words
An optical scanning device comprising: a light source from which image information light is emitted; optical scanning means for scanning the image information light emitted from said light source; an optical waveguide array for successively introducing and carrying the image information light scanned by said optical scanning means said optical waveguide array having a measurable light transmission efficiency; and means for correcting the intensity of the image information light emitted from said light source in correspondence with said light transmission efficiency of said optical waveguide array, said correction means including a transistor connected to the light source, a CPU, a RAM in which measured data of the light transmission efficiency is stored, and a buffer memory in which image signals are stored, the CPU referring to the measured data of the light transmission efficiency stored in the RAM, and converting the base currrent of the transistor so as to control the quantity of light of the light source.
Claim 6
Dependent Claim
106 words
An optical scanning device comprising: a light source from which image information light is emitted; optical scanning means for scanning the image information light emitted from said light source; an optical waveguide array for successively introducing and carrying the image information light scanned by said optical scanning means said optical waveguide array having a measurable light transmission efficiency; and means for correcting the intensity of the image information light emitted from said light source in correspondence with said light transmission efficiency of said optical waveguide, said correction means further including a switch means and constant-current circuits connected to the light source and to the switch means.
Claim 7
Dependent Claim
106 words
An optical scanning device comprising: a light source from which image information light is emitted; optical scanning means for scanning the image information light emitted from said light source; an optical waveguide array for successively introducing and carrying the image information light scanned by said optical scanning means said optical waveguide array having a measurable light transmission efficiency; and means for correcting the intensity of the image information light emitted from said light source in correspondence with said light transmission efficiency of said optical waveguide, said correction means further including a switch means and constant-current circuits connected to the light source and to the switch means.
Claim 8
Dependent Claim
21 words
An optical scanning device according to claim 4, wherein the electric current generated in said constant-current circuits assumes two factorials, respectively.
Claim 9
Dependent Claim
46 words
An optical scanning device according to claim 4, wherein said correction means arbitrarily combines said switch means based on data stored in the RAM in order to alter the electric current passing through the light source, thereby controlling the quantity of light of the light source.
References Cited (Backward Citations)
US4581617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |